I feel for all those wondering which system to get it on, you'd be best going for either the ps3 or x360 over pc especially when it comes to games like this. I don't game on the pc simply because mine is not powerful enough but for some reason I have this idea that most pc gamers are into 'FPS'. I dunno, my opinion after all. Maybe the stuff below will help you decide.
MINIMUM System Requirements:
OS: Windows Vista (Service Pack 2) 32-Bit
Processor: 2 GHz Dual Core (Core 2 Duo 2.4 GHZ or Althon X2 2.7 GHz)
Memory: 2 GB
Hard Drive: 20 GB
Graphics Card (AMD): DirectX 10.1 compatible with 512 MB RAM (ATI RADEON 3000, 4000, 5000 OR 6000 series, with ATI RADEON 3870 or higher performance)
Graphics Card (NVIDIA): DirectX 10.0 compatible with 512 MB RAM (NVIDIA GEFORCE 8, 9, 200, 300, 400 OR 500 series with NVIDIA GEFORCE 8800 GT or higher performance)
Sound card: DirectX compatible
Keyboard and Mouse
DVD ROM Drive
RECOMMENDED System Requirements:
OS: Windows 7 64-Bit
Processor: Quad-Core CPU
Memory: 4 GB
Hard Drive: 20 GB
Graphics Card: DirectX 11 compatible with 1024 MB RAM (NVIDIA GEFORCE GTX 560 or ATI RADEON 6950)
Sound Card: DirectX compatible
Keyboard and Mouse
DVD ROM Drive
And finally for anyone getting a WII-U, don't fret as it has been announced for it too and will be out sometime in 2013.